30 tina03e1 (0206) BPG400 v1.om
Gauge failures due to contamination are not covered by the warranty.
Deposits on the electrode system of the BA gauge can lead to unstable measure-
ment readings.
The degas process allows in-situ cleaning of the electrode system by heating the
electron collector grid to approx. 700 °C by electron bombardment.
Depending on the application, this function can be activated manually by a switch
or automatically by the system control via a digital interface. The BPG400
automatically terminates the degas process after 3 minutes, if it has not been
stopped before.
The degas process should be run at pressures below 7.2×10
-6
mbar
(emission current 5 mA).
For a repeated degas process, the control signal first has to change from ON
(+24 V) to OFF (0 V), to then start degas again with a new ON (+24 V) command. It
is recommended that the degas signal be set to OFF again by the system control
after 3 minutes of degassing, to achieve an unambiguous operating status.
The gauges with part number
352-501 and
353-503
have a built-in two-line display with an LCD matrix of 32×16 pixels. The first line
shows the pressure, the second line the pressure unit, the function and possible
errors. The background illumination is usually green, in the event of an error, it
changes to red. The pressure is displayed in mbar (default), Torr or Pa. The pres-
sure unit can be changed via RS232C interface (
® 2 32).
Pressure reading, pressure unit
(none) Pirani operation
Emission 25
m
A
Emission 5 mA
Degas
1000 mbar adjustment (Pirani)
4.4 Degas
Contamination
4.5 Display (BPG400)
Pressure display
Function display
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